2 * Copyright (C) 2015, 2016 "IoT.bzh"
3 * Author "Romain Forlot" <romain.forlot@iot.bzh>
4 * Author "Loic Collignon" <loic.collignon@iot.bzh>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
19 #include "low-can-hat.hpp"
26 #include <json-c/json.h>
27 #include <systemd/sd-event.h>
29 #include "openxc.pb.h"
30 #include "configuration.hpp"
31 #include "../can/can-bus.hpp"
32 #include "../can/can-signals.hpp"
33 #include "../can/can-message.hpp"
34 #include "../utils/timer.hpp"
35 #include "../utils/signals.hpp"
36 #include "../diagnostic/diagnostic-message.hpp"
37 #include "../utils/openxc-utils.hpp"
41 #include <afb/afb-service-itf.h>
44 void on_no_clients(std::string message)
46 DiagnosticRequest* diag_req = configuration_t::instance().get_request_from_diagnostic_message(message);
47 if(diag_req != nullptr)
49 active_diagnostic_request_t* adr = configuration_t::instance().get_diagnostic_manager().find_recurring_request(diag_req);
51 configuration_t::instance().get_diagnostic_manager().cleanup_request(adr, true);
55 int read(sd_event_source *s, int fd, uint32_t revents, void *userdata)
57 can_signal_t* sig= (can_signal_t*)userdata;
60 /* check if error or hangup */
61 if ((revents & (EPOLLERR|EPOLLRDHUP|EPOLLHUP)) != 0)
63 sd_event_source_unref(s);
64 sig->get_socket().close();
65 sig->create_rx_filter();
70 ///******************************************************************************
72 /// Subscription and unsubscription
74 ///*******************************************************************************/
76 static int make_subscription_unsubscription(struct afb_req request, const std::string& sig_name, std::map<std::string, struct afb_event>& s, bool subscribe)
78 /* Make the subscription or unsubscription to the event */
79 if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, s[sig_name])) < 0)
81 ERROR(binder_interface, "%s: Operation goes wrong for signal: %s", __FUNCTION__, sig_name.c_str());
87 static int create_event_handle(const std::string& sig_name, std::map<std::string, struct afb_event>& s)
89 s[sig_name] = afb_daemon_make_event(binder_interface->daemon, sig_name.c_str());
90 if (!afb_event_is_valid(s[sig_name]))
92 ERROR(binder_interface, "%s: Can't create an event for %s, something goes wrong.", __FUNCTION__, sig_name.c_str());
98 /// @brief Will determine if it is needed or not to create the event handle and checks it to be sure that
99 /// we got a valid afb_event to get subscribe or unsubscribe. Then launch the subscription or unsubscription
100 /// against the application framework using that event handle.
101 static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const std::string& sig)
105 utils::signals_manager_t& sm = utils::signals_manager_t::instance();
107 std::lock_guard<std::mutex> subscribed_signals_lock(sm.get_subscribed_signals_mutex());
108 std::map<std::string, struct afb_event>& s = sm.get_subscribed_signals();
109 if (s.find(sig) != s.end())
111 if (!afb_event_is_valid(s[sig]) && !subscribe)
113 NOTICE(binder_interface, "%s: Event isn't valid, no need to unsubscribed.", __FUNCTION__);
118 // Event it isn't valid annymore, recreate it
119 ret = create_event_handle(sig, s);
124 /* Event doesn't exist , so let's create it */
125 struct afb_event empty_event = {nullptr, nullptr};
126 s[sig] = empty_event;
127 ret = create_event_handle(sig, s);
130 // Check whether or not the event handler has been correctly created and
131 // make the subscription/unsubscription operation is so.
134 return make_subscription_unsubscription(request, sig, s, subscribe);
138 /// @brief subscribe to all signals in the vector signals
140 /// @param[in] afb_req request : contain original request use to subscribe or unsubscribe
141 /// @param[in] subscribe boolean value used to chose between a subscription operation or an unsubscription
142 /// @param[in] signals - struct containing vectors with can_signal_t and diagnostic_messages to subscribe
144 /// @return Number of correctly subscribed signal
146 static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const struct utils::signals_found& signals)
150 //TODO: Implement way to dynamically call the right function no matter
151 // how much signals types we have.
152 configuration_t& conf = configuration_t::instance();
154 for(const auto& sig : signals.diagnostic_messages)
156 diagnostic_manager_t& diag_m = conf.get_diagnostic_manager();
157 DiagnosticRequest* diag_req = conf.get_request_from_diagnostic_message(sig->get_name());
159 // If the requested diagnostic message isn't supported by the car then unsubcribe it
160 // no matter what we want, worse case will be a fail unsubscription but at least we don't
161 // poll a PID for nothing.
162 if(sig->get_supported() && subscribe)
164 float frequency = sig->get_frequency();
165 subscribe = diag_m.add_recurring_request(
166 diag_req, sig->get_name().c_str(), false, sig->get_decoder(), sig->get_callback(), (float)frequency);
167 //TODO: Adding callback requesting ignition status: diag_req, sig.c_str(), false, diagnostic_message_t::decode_obd2_response, diagnostic_message_t::check_ignition_status, frequency);
171 diag_m.cleanup_request(
172 diag_m.find_recurring_request(diag_req), true);
173 WARNING(binder_interface, "%s: signal: %s isn't supported. Canceling operation.", __FUNCTION__, sig->get_name().c_str());
177 ret = subscribe_unsubscribe_signal(request, subscribe, sig->get_name());
181 DEBUG(binder_interface, "%s: Signal: %s subscribed", __FUNCTION__, sig->get_name().c_str());
184 for(const auto& sig: signals.can_signals)
186 if(sig->create_rx_filter() <= 0 &&
187 subscribe_unsubscribe_signal(request, subscribe, sig->get_name()) <=0)
191 struct sd_event_source* e_source;
192 sd_event_add_io(afb_daemon_get_event_loop(binder_interface->daemon), &e_source, sig->get_socket().socket(), EPOLLIN, read, sig.get());
194 DEBUG(binder_interface, "%s: signal: %s subscribed", __FUNCTION__, sig->get_name().c_str());
199 static int process_args(struct afb_req request, const std::vector<std::string>& args, bool subscribe)
201 struct utils::signals_found sf;
202 int ok = 0, total = 0;
204 for(const auto& sig: args)
206 openxc_DynamicField search_key = build_DynamicField(sig);
207 sf = utils::signals_manager_t::instance().find_signals(search_key);
208 total = (int)sf.can_signals.size() + (int)sf.diagnostic_messages.size();
210 if (sf.can_signals.empty() && sf.diagnostic_messages.empty())
211 NOTICE(binder_interface, "%s: No signal(s) found for %s.", __FUNCTION__, sig.c_str());
213 ok = subscribe_unsubscribe_signals(request, subscribe, sf);
215 NOTICE(binder_interface, "%s: Subscribed/unsubscribe correctly to %d/%d signal(s).", __FUNCTION__, ok, total);
219 static const std::vector<std::string> parse_args_from_request(struct afb_req request)
222 std::vector<std::string> ret;
223 struct json_object *args, *a, *x;
225 /* retrieve signals to subscribe */
226 args = afb_req_json(request);
227 if (args == NULL || !json_object_object_get_ex(args, "event", &a))
231 else if (json_object_get_type(a) != json_type_array)
233 ret.push_back(json_object_get_string(a));
237 n = json_object_array_length(a);
238 for (i = 0 ; i < n ; i++)
240 x = json_object_array_get_idx(a, i);
241 ret.push_back(json_object_get_string(x));
248 void subscribe(struct afb_req request)
250 bool subscribe = true;
252 const std::vector<std::string> args = parse_args_from_request(request);
254 if (process_args(request, args, subscribe) > 0)
255 afb_req_success(request, NULL, NULL);
257 afb_req_fail(request, "error", NULL);
260 void unsubscribe(struct afb_req request)
262 std::vector<std::string> args;
263 bool subscribe = false;
265 args = parse_args_from_request(request);
267 if (process_args(request, args, subscribe) > 0)
268 afb_req_success(request, NULL, NULL);
270 afb_req_fail(request, "error", NULL);